It's the biggest secret on TV - who did Negan kill at the end of The Walking Dead season six?

One of the survivors famously met a grisly end at the hands of Negan and his barbed wire bat Lucille, but the show has gone to extreme lengths to make sure we don't find out until season seven.

Legendary horror make-up artist Greg Nicotero worked on the finale, and revealed that the show "spent a lot of energy" on keeping its secret.

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"We've gone to pretty significant lengths. That scene was shot on the backlot, because we didn't want it to be shot out in public where people can climb trees, or for telephoto lenses, to capture something," he said to EW.

Nicotero added: "It's unfortunate, because those people, their job is to ruin the show, and our job is to preserve the experience of the show.

"So we do have to spend a lot of energy and a lot of effort preserving the experience of watching the show. It's just the way the world is right now, and it's an unfortunate thing."